Isaac began his literary activity at the age of seventeen, when, at his father's suggestion, he wrote "Shechitah uTerefot," rules for the slaughtering of animals and the eating of their flesh.
The Ittur contains, in three parts, almost a complete code of laws, and is divided as follows: The book belongs to the classic productions of rabbinical literature in France.
At the same time he proceeds independently in his criticism, without regard to the age or reputation of former authorities, and spares not even the Geonim and Isaac Alfasi, though he admired them greatly.
[5] At the end of the seventeenth century Jacob b. Israel Sason wrote a commentary to a part of the Ittur, under the title "Bnei Ya'akov" (Constantinople, 1704).
In the eighteenth century the following authors wrote commentaries to the work: Eliezer b. Jacob ("Nachum"; not published); Abraham Giron ("Tikkun Soferim uMikra Soferim" (Constantinople, 1756, with text); Jacob b. Abraham de Boton gives fragments of his commentary to the Ittur in his collection of responsa, "Edut beYa'akov" (Salonica, 1720); while a similar work by Solomon al-Gazi was lost during its author's lifetime.